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SubjectRe: [PATCH][next] batman-adv: don't pass a NULL hard_iface to batadv_hardif_put
Date
Hi,

this looks good. David, would you pick this patch directly? Otherwise, I can
send a pull request, but right now we would only have this single patch for
net-next.

Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
Acked-by: Sven Eckelmann <sven@narfation.org>

(just discussed with Sven offline)

Thank you,
Simon

On Friday, March 23, 2018 10:53:50 PM CEST Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> In the case where hard_iface is NULL, the error path may pass a null
> pointer to batadv_hardif_put causing a null pointer dereference error.
> Avoid this by only calling the function if hard_iface not null.
>
> Detected by CoverityScan, CID#1466456 ("Explicit null dereferenced")
>
> Fixes: 53dd9a68ba68 ("batman-adv: add multicast flags netlink support")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/batman-adv/multicast.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
> index de3a055f7dd8..bd0ea374d043 100644
> --- a/net/batman-adv/multicast.c
> +++ b/net/batman-adv/multicast.c
> @@ -1536,7 +1536,7 @@ batadv_mcast_netlink_get_primary(struct
> netlink_callback *cb,
>
> if (!ret && primary_if)
> *primary_if = hard_iface;
> - else
> + else if (hard_iface)
> batadv_hardif_put(hard_iface);
>
> return ret;

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